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Isothermal transformation and precipitation behaviors of titanium microalloyed steels

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Abstract

The microstructure transformation and precipitation behavior of nano-carbides in Ti microalloyed steel during isothermal process were studied by a compression test on a Gleeble 3800 thermomechanical simulator and analyzed by optical microscopy, transmission electron microscopy and other methods. The results show that γ → α phase transformation and TiC precipitation take place in Ti microalloyed steel during the isothermal process, and time–temperature–transformation curve and precipitation–time–temperature (PTT) curve are all of “C”-type. During the isothermal process, the interphase precipitation of TiC mostly occurs at the period of the phase transformation, and the random precipitation of TiC mostly occurs on the ferrite after the phase transformation. The increment in yield strength at the initial stage of isothermal transformation mainly comes from phase transformation strengthening. With the increase in isothermal time, the precipitation hardening effect becomes more important for nucleation and growth of titanium carbides and eventually reaches the maximum value at the precipitation finished point of the PTT curve.

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Acknowledgements

The authors wish to acknowledge the experimental support from Shaoguan Steel Co., Ltd., China. Also, we would like to thank engineers and technicians of this company for their efforts in developing new steel products.

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Authors and Affiliations

  1. School of Material Science and Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

    Xiang-dong Huo

  2. Technology Quality Center, Shandong Iron and Steel Group Laiwu Co., Ltd., Laiwu, 271104, Shandong, China

    Kang He

  3. Technology and Quality Center, Shandong Iron and Steel Group Rizhao Co., Ltd., Rizhao, 276826, Shandong, China

    Ji-nian Xia

  4. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, Guangdong, China

    Lie-jun Li & Song-jun Chen

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  1. Xiang-dong Huo
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  2. Kang He
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  3. Ji-nian Xia
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  4. Lie-jun Li
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Correspondence to Xiang-dong Huo.

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Huo, Xd., He, K., Xia, Jn. et al. Isothermal transformation and precipitation behaviors of titanium microalloyed steels. J. Iron Steel Res. Int. 28, 335–345 (2021). https://doi.org/10.1007/s42243-020-00479-w

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